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FUELS AND COMBUSTION

Fuels and Combustion
The maximum percentage of CO₂ in a flue gas (from a carbonaceous fuel) can be

77
21
29
79

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Fuels and Combustion
Net calorific value is the gross calorific value less the __________ heat of water in the product of combustion when cooled to 15°C.

None of these
Sensible and latent
Latent
Sensible

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Fuels and Combustion
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its

Caking index
Calorific value
Friability & oxygen content
Yield of carbonised products

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Fuels and Combustion
Higher percentage of ash in coal meant for the production of metallurgical grade coke

Causes brittleness in steel
Decreases the hardness of coke
None of these
Decreases the abrasion resistance of coke

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Fuels and Combustion
Coals used for the generation of producer gas should have

Very low ash content (8-10%)
High volatile matter content
Low fusion point of ash
High caking index

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